Jigglypuff

• Give Kirby a Copy ability based on the character's abilities and a health item

Community-reported

• Receive a random title or avatar item, up to five times a day. Each amiibo can be used once a day.

From NintendoSource

• Unlock a character-based Mystery Mushroom costume

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Unlock randomly assigned three-minute NES or SNES game scenes. Subsequent scans change the scene.

From NintendoSource